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At the lowest level, all C# I/O operates on bytes This makes sense because many devices are byte oriented when it comes to I/O operations Frequently, though, we humans prefer to communicate using characters Recall that in C#, char is a 16-bit type, and byte is an 8-bit type If you are using the ASCII character set, then it is easy to convert between char and byte; just ignore the high-order byte of the char value But this won t work for the rest of the Unicode characters, which need both bytes (and possibly more) Thus, byte streams are not perfectly suited to handling character-based I/O To solve this problem, the NET Framework defines several classes that convert a byte stream into a character stream, handling the translation of byte-to-char and char-to-byte automatically

Three predefined streams, which are exposed by the properties called ConsoleIn, ConsoleOut, and ConsoleError, are available to all programs that use the System namespace ConsoleOut refers to the standard output stream By default, this is the

THE MOUSEEVENTARGS CLASS As you can see from the table, all mouse event handlers received an instance of the MouseEventArgs class as their event parameters. A summary of this class appears in .NET Table 12.3. We will illustrate mouse events a few different ways in this chapter. Our first example will combine the keyboard support we examined in the previous chapter with mouse events. HANDLING MOUSE EVENTS Since we have seen a couple of mouse events before, let s make a change that involves both keyboard and mouse events. Keeping with our theme of the Previous and Next menus, let s modify the mouse button behavior in our Panel control so that the left and right buttons invoke the Previous and Next menus, respectively, when the Ctrl key is pressed.

Part I:

The MouseEventArgs class is the event argument class associated with the mouse events. This class represents information about the mouse device and the mouse pointer position when the event occurs. It is part of the System.Windows.Forms namespace, and inherits from the System.EventArgs class. Button Clicks Gets the MouseButtons enumeration value corresponding to the mouse button pressed by the user. Gets the number of times the mouse button was pressed and released. Note that the DoubleClick event should normally be used to process double-clicks of the mouse. Gets a signed integer representing the number of detents the mouse wheel has rotated. A detent is a rotation of the mouse wheel by one notch. Gets the x-coordinate of the current mouse pointer position. Gets the y-coordinate of the current mouse pointer position.

console When you call ConsoleWriteLine( ), for example, it automatically sends information to ConsoleOut ConsoleIn refers to standard input, which is, by default, the keyboard ConsoleError refers to the standard error stream, which is also the console by default However, these streams can be redirected to any compatible I/O device The standard streams are character streams Thus, these streams read and write characters

The NET Framework defines both byte and character stream classes However, the character stream classes are really just wrappers that convert an underlying byte stream to a character stream, handling any conversion automatically Thus, the character streams, while logically separate, are built upon byte streams The core stream classes are defined within the SystemIO namespace To use these classes, you will usually include the following statement near the top of your program:

Figure 7-5

This requires handling both the KeyDown and KeyUp events to track when the Ctrl key is held down, and the MouseDown event to map a mouse click to the appropriate menu. Once we have done this, we will discover some additional changes that will improve our interface. First, let s take a look at how to track the Ctrl key.

using SystemIO;

Set the version number of the MyPhotos application to 12.2. TRACK WHEN THE CTRL KEY IS HELD DOWN Action 1 In the MainForm.cs window, create a boolean field to identify when the Ctrl key is held down. Modify the OnKeyDown method to set this field to true. Result

The reason that you don t have to specify SystemIO for console input and output is that the Console class is defined in the System namespace